|Número de publicación||US8109957 B2|
|Tipo de publicación||Concesión|
|Número de solicitud||US 11/427,848|
|Fecha de publicación||7 Feb 2012|
|Fecha de presentación||30 Jun 2006|
|Fecha de prioridad||30 Jun 2006|
|También publicado como||CA2656371A1, CA2656371C, EP2037824A2, EP2037824A4, US20080086157, US20120179183, WO2008005119A2, WO2008005119A3|
|Número de publicación||11427848, 427848, US 8109957 B2, US 8109957B2, US-B2-8109957, US8109957 B2, US8109957B2|
|Inventores||Shawn D. Stad, John Riley Hawkins, Michael J. O'Neil|
|Cesionario original||Depuy Spine, Inc.|
|Exportar cita||BiBTeX, EndNote, RefMan|
|Citas de patentes (50), Otras citas (2), Citada por (5), Clasificaciones (9), Eventos legales (2)|
|Enlaces externos: USPTO, Cesión de USPTO, Espacenet|
The present invention relates to medical devices and methods for removing tissue, and in particular, to medical devices and methods for removing nucleus tissue from an intervertebral disc.
The intervertebral discs that reside between each vertebra of the spine act as shock absorbers between the vertebrae. The disc itself consists of a tough outer layer called the annulus, and soft inner material, called the nucleus. The soft nucleus absorbs the majority of the shock as the body moves, keeping the spine supple and supported. As one ages, both the annulus and the nucleus lose some of their cushioning ability, and a greater portion of the pressure is borne by the outside of the disc, the annulus.
An artificial disc (also called a disc replacement, disc prosthesis or spine arthroplasty device) is a device that is implanted into the spine to imitate the functions of a normal disc (i.e., carry load and allow motion). There are many artificial disc designs classified into two general types: total disc replacement and disc nucleus replacement. As the names imply, with a total disc replacement, all or most of the disc tissue is removed and a replacement device is implanted into the space between the vertebra. With a disc nucleus replacement, only the center of the disc (the nucleus) is removed and replaced with an implant. The outer part of the disc (the annulus) is not removed. Disc nucleus replacement surgery offers certain benefits compared to total disc replacement. Since a disc nucleus replacement device is designed to replace only the nucleus of the disc, the procedure is less time consuming and possesses less risk to surrounding structures. Another benefit of disc nucleus replacement surgery is that it results in the retention of a greater amount of tissue, which gives the disc a greater regenerative capacity.
An important aspect of disc nucleus replacement surgery is to remove all of the nucleus material before installing the nucleus replacement device. In addition, care must be taken to avoid creating too large a defect in the annular wall. Incomplete or inadequate clearance of the disc nucleus, or formation of too large an annular defect, can cause the nucleus replacement to be expelled from or to extrude from the disc space.
Accordingly, there remains a need for improved devices and methods for removing nucleus tissue from an intervertebral disc, and in particular, devices and methods for removing nucleus tissue that minimize the required annular defect.
The present invention provides devices and methods for removing tissue. In one aspect, a device for removing tissue is provided that includes a hollow elongate member having an outer wall and a lumen, a selectively deployable tissue-cutting element extending from the hollow elongate member, and an actuation member extending through the lumen and communicating with the hollow elongate member at a location that is distal to the tissue-cutting element. Movement of the actuation member can cause the tissue-cutting element to move from the insertion configuration where the tissue-cutting element is not deployed to a tissue-cutting configuration where the tissue-cutting element is deployed such that it is radially extended relative to the insertion configuration. In use, the actuation member effects deployment of the tissue-cutting element by compression of the elongate member, and the compression is effected by rotation of a portion of the elongate member distal to the tissue-cutting element. In one embodiment, the actuation member and the elongate member are adapted to move independently of one another, and/or the tissue-cutting element is adapted to move independently of the elongate member.
The tissue-cutting element can have a variety of configurations. In one embodiment, the tissue-cutting element can be formed on at least a portion of the hollow elongate member. In another embodiment, the tissue-cutting element can be an arm that is formed by the portion of the elongate member that is between adjacent slits. The at least two adjacent slits can be formed in the outer wall of the elongate member and located proximal to a distal end of the elongate member. The slits can extend proximally over a distance that is less than a length of the elongate member. In other embodiments, the tissue-cutting element can include at least two radially-extendable arms that are formed between a plurality of slits. In alternate embodiments, the tissue-cutting element can be helically shaped and/or include a sharpened edge. The actuation member can also have a variety of configurations, however in one embodiment, the actuation member comprises at least one tether.
The device can also include a variety of other features to facilitate the removal of tissue. In one embodiment, the lumen of the elongate member can be adapted accommodate an irrigation fluid and/or suction. By way of non-limiting example, a fluid input conduit and a suction conduit can be disposed in the lumen. In another embodiment, the outer wall of the elongate member can be adapted to be positioned within a cannula. For example, the distal portion of the elongate member that includes the tissue-cutting element can include a ledge that abuts a shoulder of the cannula, such that the tissue-cutting element protrudes from the cannula.
The device can also include a locking mechanism that is adapted to hold the actuation member in the actuated position. Additionally or alternatively, the device can include a steering element that is adapted to control directional movement of the elongate member. The steering element can have a variety of configurations, and in one embodiment, the steering element is a joint formed between proximal and distal ends of the elongate member. In another embodiment, the steering element can be a tether that extends through the lumen of the elongate member and is coupled to the elongate member, which is flexible, at a location that is distal to the tissue-cutting element.
Methods for the removing tissue are also disclosed herein. In one aspect, a method for removing tissue includes positioning a tissue removal device at a site within a disc space, the tissue removal device having an elongate member with at least one selectively deployable tissue-cutting element and an actuation member. The method further includes applying a force to the actuation member to cause the tissue-cutting element to move from a non-deployed insertion configuration to a deployed, tissue-cutting configuration in which the tissue-cutting element is radially extended relative to the insertion configuration, and manipulating the tissue removal device within the disc space to cut and remove selected disc tissue. In one embodiment, the hollow elongate member is adapted move independently from the actuation member, and/or the tissue-cutting element is adapted to move independently of the elongate member.
The method can also include a variety of other steps to facilitate tissue removal. In one embodiment, the method can further include delivering fluid to the tissue site through the lumen. Alternatively or additionally, the method can include applying suction to the tissue site through the lumen and/or positioning at least a portion of the elongate member within a cannula for delivery to the disc space.
The invention will be more fully understood from the following detailed description taken in conjunction with the accompanying drawings, in which:
Certain exemplary embodiments will now be described to provide an overall understanding of the principles of the structure, function, manufacture, and use of the devices and methods disclosed herein. One or more examples of these embodiments are illustrated in the accompanying drawings. Those of ordinary skill in the art will understand that the devices and methods specifically described herein and illustrated in the accompanying drawings are non-limiting exemplary embodiments and that the scope of the present invention is defined solely by the claims. The features illustrated or described in connection with one exemplary embodiment may be combined with the features of other embodiments. Such modifications and variations are intended to be included within the scope of the present invention.
The present invention provides devices and methods for tissue removal. The tissue removal devices disclosed herein generally include an elongate member that has a tissue-cutting element formed on a distal end thereof. An actuation member can extend through the elongate member and couple to the tissue-cutting element to control or influence the configuration and/or orientation thereof. Upon actuation of the member, the sections of the elongate member that contain the tissue-cutting elements bow or deflect to expose cutting surfaces. The device can then be manipulated within a target site to cut tissue so that it can be removed by suction or other means. One skilled in the art will appreciate that the device can be used to remove a variety of types of tissue, however in an exemplary embodiment the device can be used in spinal surgery to remove disc nucleus tissue.
The elongate member 12 can have virtually any configuration that allows it to be inserted to a surgical site. In one aspect, the member 12 is configured for delivery to the surgical site in a minimally invasive manner, such as via a cannula. As shown, the member 12 is substantially cylindrical and sufficiently strong to be inserted into tissue. The elongate member 12 can also include features to facilitate minimally invasive delivery, and as shown in
The elongate member 12 can have a variety of sizes, depending upon the intended use of the device 10. However, in one embodiment where the device 10 is used for disc nucleus removal, the elongate member 12 can have an outer diameter of about 5 mm (or less) when it is in the insertion configuration. The elongate member 12 can also be formed from a variety of materials, such as biocompatible metals, medical grade plastics, and/or combinations thereof. Exemplary biocompatible metals can include stainless steel, titanium, titanium alloys, cobalt chromium alloys, nitinol, and combinations thereof. Exemplary medical grade plastics can include nylon, polyolefins, ABS, PEEK, polysulfones, polyacetal, and combinations thereof.
At least one tissue-cutting element 19 can be formed on the distal end 12 b of the member 12 that is able to be exposed (e.g., by extending radially) when subjected to a force.
The tissue-cutting element 19 can have any configuration that allows it to be configured to cut tissue (e.g., radially extend) upon the application of a force (e.g., compression) thereto. In one embodiment, the tissue-cutting element 19 can include at least one arm (arms 20 a-20 j are shown in
The arms can also have a variety of sizes depending upon the intended application of the device, however the arms can generally extend proximally from a position adjacent to the distal end of the device over a distance that is less than a length of the elongate member. By way of non-limiting example, when the device is used to remove disc nucleus material, the arms can be separated by a distance in the range of about 0.1 mm to 3 mm and extend a distance in the range of 5 mm to 50 mm along the elongate member. One skilled in the art will appreciate that a variety of techniques can be used to form the slits, and hence the arms, however in an exemplary embodiment, the slits can be formed by a laser cutting technique or an EDM technique.
A variety of techniques can be used to apply a force to the tissue-cutting elements to cause them to radially extend into a tissue-cutting configuration. In one embodiment, the device can include an actuation member that can extend through the elongate member and couple to the distal most portion of the tissue-cutting element. While the actuation member can have a variety of configurations, as shown in
Referring back to
A variety of techniques can be used to facilitate motion of the joint 128. By way of non-limiting example, two pull wires 130, 132 can extend through at least a portion of the elongate member 112 and couple to elongate member 112 at a location that is distal to the joint 128. Control elements 134, 136 can be formed on the proximal end of the wires 130, 132 and can be used to grip and apply tension to one of the wires 130, 132 to effect directional movement of the tissue-cutting element 119. While
As noted above, the elongate member 112 can also include a handle 138 that is located on the proximal end 112 a thereof to facilitate manipulation and handling of the device 110. While the handle 138 can have any configuration that allows a user to conveniently hold and operate the device 110, in one embodiment the handle 138 has a substantially elongate shape. The handle 138 can include features to facilitate actuation of the actuation member. For example, the handle 138 can include a sliding actuator lever 131 that can be coupled to the actuation member and that allows tension to be selectively applied thereto. In alternate embodiments, rotatable knobs or dials can be used to selectively apply tension to the actuation member. A locking mechanism (not shown) can also be associated with the sliding actuator lever to hold the actuation member in a desired position once tension is applied.
The handle 138 can also include a driving mechanism to facilitate movement of the tissue-cutting element 119 to effect cutting of tissue when it is in the tissue-cutting configuration. For example, as shown, the handle 138 can include a rotatable knob 140 to effect rotational movement of the tissue-cutting element 119. Additionally, the handle can include features to facilitate the removal of tissue, such as a port for delivering suction and/or irrigation to the elongate member, or it can be adapted to couple to an external suction and/or irritation port. One skilled in the art will appreciate the variety of features that can be formed on the handle.
The device 510 can also include features that facilitate insertion within a cannula 550. While a variety of features can be used, as shown each elongate member 512 can include opposed ledges 582, 584 that are formed thereon at a location that is proximal to the tissue-cutting element 519. The ledges 582, 584 are adapted to abut corresponding shoulders 572, 574 that are formed on a cannula 550. One skilled in the art will appreciate that the ledges and shoulders can have a variety of sizes, depending upon the intended use of the device. In use, and as a force (i.e., tension) is applied to the actuation member 514, the ledge 582, 584 is pressed against the shoulder 572, 574 to facilitate the radial expansion of the tissue-cutting element 519.
One skilled in the art will appreciate that each of the various designs provides for disc removal with cutting surfaces. The cutting surfaces can be located along the leading edge(s) of the blade(s) and can be tapered to a relatively sharp cutting tip or plane. The helically shaped cutting elements allow for cutting via rotary motions prompting the collection of the loose disc tissue in the central portion of the device and for aspiration with the central cannula. The multiple blades of the helical shaped cutting element provide for the exposure of additional cutting surfaces for each rotation when compared to the dual blade device shown in
The devices disclosed herein can be used to remove tissue from, for example, the nucleus of a disk. While the method is described in connection with device of
Once the device 210 is positioned within the nucleus 254, a force can be applied to the actuation member 214. For embodiments where the actuation member is a tether 214, the tether 214 can be pulled in the proximal direction to cause the tissue-cutting element to radially expand to the tissue-cutting configuration. Depending upon the configuration of the device, the tension can be applied to the tether directly, or by movement of a lever, dial, or knob formed on a handle of the device. As a result, the device 210 moves from the insertion configuration to the tissue-cutting configuration, where the tissue-cutting arm 220 a is radially expanded relative to the elongate member 212, as shown in
Once the device is in the tissue-cutting configuration, the device can be moved to cut tissue, and it can be steered, as appropriate, to reach areas of the nucleus that require removal of tissue. Depending upon the type of tissue cut desired, the device can be rotated, moved forward, or moved in reverse. One skilled in the art will appreciate that movement of the device can be effected by directly moving the elongate member, by moving a lever, dial, or knob on the handle of the device, and/or by activating an energy source to deliver energy to the tissue-cutting element. As the tissue is being cut, or alternatively, once all of the tissue is cut, the tissue fragments can be removed from the disc. While a variety of removal techniques can be used, in one embodiment and still referring to
Following the removal of the tissue, the locking mechanism can optionally be unlocked and the force that is applied to the actuation member released. This causes the tissue-cutting element to radially retract back to the insertion configuration. The device can then be removed from the tissue, leaving behind a substantially tissue-free nucleus space and minimizing the size of the annular defect.
One skilled in the art will appreciate further features and advantages of the invention based on the above-described embodiments. Accordingly, the invention is not to be limited by what has been particularly shown and described, except as indicated by the appended claims. All publications and references cited herein are expressly incorporated herein by reference in their entirety.
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|30 Jun 2006||AS||Assignment|
Owner name: DEPUY SPINE, INC., MASSACHUSETTS
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:STAD, SHAWN D.;HAWKINS, JOHN RILEY;O NEIL, MICHAEL J.;REEL/FRAME:017860/0187
Effective date: 20060629
|22 Jul 2015||FPAY||Fee payment|
Year of fee payment: 4